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现在我的 web 应用程序快完成了，我想以附件的形式将结果通过电子邮件发送给自己。附件的内容是变量“Gcode”的内容，这是一个大字符串，如下所示：“G00X12.46Y18.51 G01X12.46Y21.62 G01X13.79Y21.62 G00X10.00Y23.00”邮件我收到一条错误消息：TypeError: 'list' object is not callable。我发现附件必须是字节串。这是问题吗？

class send_mail(webapp2.RequestHandler):
  def post(self):
    material = self.request.get('material')
    thickness = self.request.get('thickness')
    fileName = self.request.get('fileName')
    Gcode = self.request.get('Gcode')
    sheetSize = self.request.get('sheetSize')
    recieve_address = 'me@hotmail.com'
    attachments=[(fileName+'.nc', 'Gcode')]
    if not mail.is_email_valid(user_address):
      Gcode = ''
    else:
      confirmation_url = Gcode
      sender_address = "theLaserLab.com <theLaserLab@gmail.com>"
      subject = "Order content"
      body = "The attached file: %s.nc. Is supposed to cut from a sheet of %s that is    %smm thick and has a %s dimension." % (fileName, material, thickness, sheetSize)
      mail.send_mail(sender_address, recieve_address, subject, body, attachments)
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